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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Louisiana doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The LA CDL doubles triples test covers the following sections of the Louisiana CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this LA CDL practice test now to prepare for the actual test!
1. Too much weight on the steering axle can cause:
hard steering and damage to the steering axle and tires.
poor traction.
better handling.
None of the above.
2. When coupling twin trailers, the more heavily loaded semitrailer should:
be in the rear.
have its brakes locked.
have chocked wheels.
be in first position behind the tractor.
3. Which of these is more likely to rollover due to the "crack-the-whip" effect?
The last trailer of doubles
The front trailer of 65 ft. conventional doubles
5-axle tractor semitrailers
The last trailer of triples
4. If a load is 10 feet long, the minimum number of tie-downs required is:
5. Fully loaded rigs:
are less likely to roll over than empty rigs.
are much more likely to roll over than empty rigs.
are just as likely to roll over as empty rigs.
None of the above.
6. After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
25 miles
20 miles
50 miles
two hours
7. Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
shifting into neutral may help slow the vehicle.
the parking brake should never used to slow the vehicle.
All of the above.
8. When driving in heavy traffic, the safest speed is:
the same speed as the other vehicles.
half the speed of the other vehicles.
slower than the other vehicles.
faster than the other vehicles.
9. You are driving a vehicle with air brakes when the low air pressure warning light and buzzer come on. You should:
slow down and test your brakes.
apply the brakes as hard as you can.
activate your hazard lights and drive to the nearest place where you can stop.
pull off the road and stop immediately.
10. When driving a double or triple, you should:
decrease your following distance.
increase your following distance.
drive with emergency flashers on.
drive in the left lane whenever possible.
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LA Doubles Triples CDL Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
Number of questions: 20
Correct answers to pass:16
Passing score:80%
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